/Engine/Plugins/Interchange/Runtime/Source/Import/Public/MaterialX/MaterialXUtils/MaterialXManager.h
void RegisterMaterialXInstance ( const [FString](API\Runtime\Core\Containers\FString) & CategoryShader, [FOnGetMaterialXInstance](API\Plugins\InterchangeImport\MaterialX\MaterialXUtils\FMaterialXManager\FOnGetMaterialXI-) MaterialXInstanceDelegate )